The red graph was from my stock S w/ only the JR filter. After some fiddling w/ the Apexi V-AFC, the S gains some meaning torque from 2000 rpm to 4000 rpm and from 6000 rpm to 7000 rpm. Horsepower is also lifted from 6000 rpm to 7000 rpm and from 8000 rpm to 9000 rpm.

I though these rpm ranges are particularly important b/c most daily driving is done between 3000 and 4000 rpm, and 6 and 7 is where you'll land after redline upshift. It is also where you want to be in a rolling start.

Can I feel the difference? Oh, yeah! You better believe it.

I have heard this device can give u a peak gain of up to 7 or 8 hp, but I didn't want to push it. I heard it from somewhere else Honda purposely running it a little too rich for safety reasons.

I have had this device for months (although I just recently dyno-tuned it) and I do not believe the ECU compensates to offset the changes made.

Reading the graphs, keep in mind the stock graph was done in the first run, and the V-AFC graph was from the final 10th run, with no cooling periods -- heat soak could and should be a factor.

I do have a question I hope you guys can help me with. I just installed the Mugen header and I won't dyno-tune this thing again too soon. How do you think the header will affect the fuel/air ratio setup? Should it be tuned even leaner, or richer?
Thanks for your help in advance.

 

can you post what your Vafc settings are???